When calling requestPresent with a new canvas, do not exit fullscreen and swap canvases. Necessary for presenting via user-gesture before a canvas can be acquired, like for the WebXR polyfill, which needs to create a session via user-gesture, but does not have a canvas until baseLayer is set. Similarly in polyfill land, there are browsers that require a user-gesture for fullscreen (at least Firefox/Android from my testing). In order to polyfill a WebXR style way of presenting on Cardboard/1.1, we must call requestPresent with a dummy canvas and preserve the fullscreen request, and subsequently call requestPresent again with the real canvas from the session's baseLayer.
When calling requestPresent with a new canvas, do not exit fullscreen and swap canvases. Necessary for presenting via user-gesture before a canvas can be acquired, like for the WebXR polyfill, which needs to create a session via user-gesture, but does not have a canvas until
baseLayeris set. Similarly in polyfill land, there are browsers that require a user-gesture for fullscreen (at least Firefox/Android from my testing). In order to polyfill a WebXR style way of presenting on Cardboard/1.1, we must callrequestPresentwith a dummy canvas and preserve the fullscreen request, and subsequently callrequestPresentagain with the real canvas from the session'sbaseLayer.